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Joerg Wagner
Joerg Wagner
Senior III
September 9, 2017
Solved

STM32F769I-DISCO LCD RTOS LwIP : screen corrupted [solved]

  • September 9, 2017
  • 2 replies
  • 945 views
Posted on September 09, 2017 at 20:40

Hello.

Based on the HAL example >Applications>Display>LCD_PicturesFromSDCard I converted

this into a CubeMX (V1.7.0) project, which works fine. Adding FreeRTOS works as well.

But if I add LwIP (just adding) sometimes the image is not shown properly.

Parts of the image is corrupted on the screen.

Regardless if DHCP/static and memory settings for LwIP and FreeRTOS.

It does occur i.e. after every 6-20th image loading. There is no rule.

Why is it a problem to use LwIP in this case?

Thank you for every hint.

    This topic has been closed for replies.
    Best answer by Joerg Wagner
    Posted on September 19, 2017 at 01:13

    I found the reason:

    Image files are processed via DMA and I also use DMA for sending data via UART.

    Both streams are in the same DMA controller (#2) and this causes the collision.

    2 replies

    Imen.D
    ST Technical Moderator
    September 12, 2017
    Posted on September 12, 2017 at 12:46

    Hello,

    Verify the stack and heap values of your project and I suggest that you take a look to the following resources about LWIP which can help you in your application:

    • UM1718, paragraph 'B.3.6 LwIP' for the STM32CubeMX LwIP side.
    • UM1713 “Developing applications on STM32Cube with LwIP TCP/IP stack“

    Kind Regards

    Imen

    In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
    Joerg Wagner
    Joerg WagnerAuthorBest answer
    Senior III
    September 18, 2017
    Posted on September 19, 2017 at 01:13

    I found the reason:

    Image files are processed via DMA and I also use DMA for sending data via UART.

    Both streams are in the same DMA controller (#2) and this causes the collision.

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